OpenSSH : Use Parallel SSH2023/12/19 |
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Install Parallel SSH to connect to multiple hosts.
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| [1] | Install PSSH. |
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root@dlp:~ # pkg install -y pssh
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| [2] | This is the basic usage for PSSH. This is the case for key-pair authentication without passphrase. If passphrase is set in key-pair, start SSH-Agent first to automate inputting passphrase. |
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# connect to hosts and execute [hostname] command freebsd@dlp:~ $ pssh -H "10.0.0.51 10.0.0.52" -i "hostname" [1] 13:45:41 [SUCCESS] 10.0.0.52 node02.srv.world [2] 13:45:41 [SUCCESS] 10.0.0.51 node01.srv.world # it's possible to read host list from a file
freebsd@dlp:~ $
vi pssh_hosts.txt # write hosts per line like follows freebsd@10.0.0.51 freebsd@10.0.0.52 pssh -h pssh_hosts.txt -i "uptime" [1] 13:47:18 [SUCCESS] freebsd@10.0.0.51 1:47PM up 4:44, 1 user, load averages: 0.25, 0.23, 0.21 [2] 13:47:18 [SUCCESS] freebsd@10.0.0.52 1:47PM up 10 mins, 1 user, load averages: 0.23, 0.21, 0.15 |
| [3] | It's possible to connect with password authentication too, but it needs passwords on all hosts are the same one. |
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freebsd@dlp:~ $ pssh -h pssh_hosts.txt -A -O PreferredAuthentications=password,keyboard-interactive -i "uname -r" Warning: do not enter your password if anyone else has superuser privileges or access to your account. Password: # input password [1] 13:59:37 [SUCCESS] freebsd@10.0.0.51 14.0-RELEASE [2] 13:59:37 [SUCCESS] freebsd@10.0.0.52 14.0-RELEASE |
| [4] |
By the way, PSSH package includes [parallel-scp], [parallel-rsync], [parallel-slurp], [parallel-nuke] commands and you can use them with the same usage of pssh.
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